External Monitor Disables Screen Saver and Power Plan

I have replaced an HP Pavilion notebook running XP Pro with a new HP Pavilion
notebook running Vista Ultimate. I had been using an external Acer LCD
monitor with the old notebook. With the new notebook and Vista, the external
monitor seems to disable both the screen saver and the power plan settings.
The display simply stays on indefinitely. On a couple of rare occasions I was
able to get it working correctly, but it does not last. I would like the
external dispaly to sleep at the appropriate times as set in the power plan.
This problem did not exist with the XP Pro notebook.
--
bigvee_nh

On Jan 17, 4:08 pm, bigvee_nh <bigve...@discussions.microsoft.com>
wrote:
> I have replaced an HP Pavilion notebook running XP Pro with a new HP Pavilion
> notebook running Vista Ultimate. I had been using an external Acer LCD
> monitor with the old notebook. With the new notebook and Vista, the external
> monitor seems to disable both the screen saver and the power plan settings.
> The display simply stays on indefinitely. On a couple of rare occasions I was
> able to get it working correctly, but it does not last. I would like the
> external dispaly to sleep at the appropriate times as set in the power plan.
> This problem did not exist with the XP Pro notebook.
> --
> bigvee_nh

I am having the same problem. Did you find a solution?
TNJules